2x^2-12x=151

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Solution for 2x^2-12x=151 equation:


Simplifying
2x2 + -12x = 151

Reorder the terms:
-12x + 2x2 = 151

Solving
-12x + 2x2 = 151

Solving for variable 'x'.

Reorder the terms:
-151 + -12x + 2x2 = 151 + -151

Combine like terms: 151 + -151 = 0
-151 + -12x + 2x2 = 0

Begin completing the square.  Divide all terms by
2 the coefficient of the squared term: 

Divide each side by '2'.
-75.5 + -6x + x2 = 0

Move the constant term to the right:

Add '75.5' to each side of the equation.
-75.5 + -6x + 75.5 + x2 = 0 + 75.5

Reorder the terms:
-75.5 + 75.5 + -6x + x2 = 0 + 75.5

Combine like terms: -75.5 + 75.5 = 0.0
0.0 + -6x + x2 = 0 + 75.5
-6x + x2 = 0 + 75.5

Combine like terms: 0 + 75.5 = 75.5
-6x + x2 = 75.5

The x term is -6x.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6x + 9 + x2 = 75.5 + 9

Reorder the terms:
9 + -6x + x2 = 75.5 + 9

Combine like terms: 75.5 + 9 = 84.5
9 + -6x + x2 = 84.5

Factor a perfect square on the left side:
(x + -3)(x + -3) = 84.5

Calculate the square root of the right side: 9.192388155

Break this problem into two subproblems by setting 
(x + -3) equal to 9.192388155 and -9.192388155.

Subproblem 1

x + -3 = 9.192388155 Simplifying x + -3 = 9.192388155 Reorder the terms: -3 + x = 9.192388155 Solving -3 + x = 9.192388155 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = 9.192388155 + 3 Combine like terms: -3 + 3 = 0 0 + x = 9.192388155 + 3 x = 9.192388155 + 3 Combine like terms: 9.192388155 + 3 = 12.192388155 x = 12.192388155 Simplifying x = 12.192388155

Subproblem 2

x + -3 = -9.192388155 Simplifying x + -3 = -9.192388155 Reorder the terms: -3 + x = -9.192388155 Solving -3 + x = -9.192388155 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = -9.192388155 + 3 Combine like terms: -3 + 3 = 0 0 + x = -9.192388155 + 3 x = -9.192388155 + 3 Combine like terms: -9.192388155 + 3 = -6.192388155 x = -6.192388155 Simplifying x = -6.192388155

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.192388155, -6.192388155}

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